1. Research Assistant, Univ. of Cergy-Pontoise, L2MGC, EA 4114, F—95000 Cergy-Pontoise, France.
2. Associate, Univ. of Cergy-Pontoise, L2MGC, EA 4114, F—95000 Cergy-Pontoise, France.
3. Professor, Univ. of Cergy-Pontoise, L2MGC, EA 4114, F—95000 Cergy-Pontoise, France (corresponding author).
4. Professor, Univ. of Cergy-Pontoise, L2MGC, EA 4114, F—95000 Cergy-Pontoise, France.